Rah! Downstream speed issue - 4 months+

I have been trying to resolve a fault on my BB connection since December.
I have the following:
DSL Connection Rate: 8128
IP Profile: 7150
(Perfect connection to the Exchange)
Download Speed: 87 - 200 KBps (from speedtester.bt.com)
I have had a number of complex engineers reset the connection at the exchange, 6Mb+ download speed returns for 24-48 hours then it degrades again.
I'm sure the equipment at the exchange is faulty but they seem reluctant to replace it.
Anybody able to help guide me on this?
Kevin

ADSL Settings
VPI/VCI
0/38
Type
PPPoA
Modulation
G.992.1 Annex A
Latency type
Fast
Noise margin (Down/Up)
13.4 dB / 25.0 dB
Line attenuation (Down/Up)
12.3 dB / 6.0 dB
Output power (Down/Up)
12.4 dBm / 1.7 dBm
Loss of Framing (Local/Remote)
0 / 0
Loss of Signal (Local/Remote)
0 / 0
Loss of Power (Local/Remote)
0 / 0
FEC Errors (Down/Up)
0 / 1
CRC Errors (Down/Up)
65 / 0
HEC Errors (Down/Up)
75 / 0
Error Seconds (Local/Remote)
65 / 3

Similar Messages

Home Hub 3 Speed Issue

Some 6 weeks ago I had an issue with losing my internet connection completly, and eventually after a long session with the help desk I magaged to reconnect using the direct port on the main phone socket. However since then I have had a speed issue and Ive been only getting speeds in the order of 2.3Mb.
However running the BT speed test tells me that the connection to my Home Hub 3 is running at 8.13Mb, but the connection to my computer is running at 2.18Mb.
I have tried every thing I can think of. Followed all the advice to improve the connection but nothing works. Reseting the Home Hub, reseting the factory defaults. I've closed down every program running in the background, disconnected the rest of the hardwired network, fitted a new shorter cat 6 cable. All to no avail. The speed still stays firmly at 2.18 to 2.15. down and 0.37 up.
Could their be a fault with my Home Hub?
Thaks for any advice.
Roy
Solved!
Go to Solution.

23:38:00, 29 Jul.
( 5932.320000) CWMP: Session start now. Event code(s): '4 VALUE CHANGE'
23:37:29, 29 Jul.
( 5901.890000) CWMP: session closed due to error: No response
23:37:28, 29 Jul.
( 5900.920000) CWMP: Server URL: https://pbthdm.bt.mo; Connecting as user: ACS username
23:37:28, 29 Jul.
( 5900.910000) CWMP: Session start now. Event code(s): '4 VALUE CHANGE'
23:37:28, 29 Jul.
( 5900.480000) CWMP: Initializing transaction for event code 4 VALUE CHANGE
23:37:24, 29 Jul.
( 5896.840000) DSL is down after 2 minutes uptime
23:37:24, 29 Jul.
( 5896.840000) ETHoA is down after 2 minutes uptime
23:37:24, 29 Jul.
( 5896.200000) PPPoA is down after 2 minutes uptime [Waiting for Underlying Connection (WAN DSL - Up)]
23:37:20, 29 Jul.
( 5892.820000) PPP LCP Send Termination Request [User request]
23:36:35, 29 Jul.
( 5847.820000) CWMP: session completed successfully
23:36:34, 29 Jul.
( 5846.940000) CWMP: HTTP authentication success from https://pbthdm.bt.mo
23:36:32, 29 Jul.
IN: BLOCK [16] Remote administration (TCP [116.10.191.167]:6000->[81.154.29.9]:22 on ppp0)
23:36:32, 29 Jul.
( 5844.670000) CWMP: Server URL: https://pbthdm.bt.mo; Connecting as user: ACS username
23:36:32, 29 Jul.
( 5844.660000) CWMP: Session start now. Event code(s): '6 CONNECTION REQUEST,4 VALUE CHANGE'
23:36:32, 29 Jul.
( 5844.050000) CWMP: Initializing transaction for event code 6 CONNECTION REQUEST
23:35:08, 29 Jul.
( 5760.150000) CWMP: session completed successfully
23:35:07, 29 Jul.
( 5759.850000) CWMP: HTTP authentication success from https://pbthdm.bt.mo
23:34:55, 29 Jul.
( 5746.980000) CWMP: Server URL: https://pbthdm.bt.mo; Connecting as user: ACS username
23:34:55, 29 Jul.
( 5746.970000) CWMP: Session start now. Event code(s): '4 VALUE CHANGE'
23:34:48, 29 Jul.
( 5740.780000) PPP IPCP Receive Configuration ACK
23:34:48, 29 Jul.
( 5740.580000) PPP IPCP Send Configuration ACK
23:34:48, 29 Jul.
( 5740.580000) PPP IPCP Receive Configuration Request
23:34:48, 29 Jul.
( 5740.290000) PPP IPCP Send Configuration Request
23:34:48, 29 Jul.
( 5740.290000) PPP IPCP Receive Configuration NAK
23:34:47, 29 Jul.
( 5739.870000) PPP IPCP Send Configuration ACK
23:34:47, 29 Jul.
( 5739.870000) PPP IPCP Receive Configuration Request
23:34:47, 29 Jul.
( 5738.990000) PPP IPCP Send Configuration ACK
23:34:47, 29 Jul.
( 5738.990000) PPP IPCP Receive Configuration Request
23:34:45, 29 Jul.
( 5737.420000) PPP IPCP Send Configuration Request
23:34:45, 29 Jul.
( 5737.410000) WAN operating mode is DSL
23:34:45, 29 Jul.
( 5737.410000) Last WAN operating mode was DSL
23:34:43, 29 Jul.
( 5735.310000) PPPoA is up - VPI: 0, VCI:38
23:34:43, 29 Jul.
( 5735.290000) CHAP authentication successful
23:34:43, 29 Jul.
( 5735.260000) CHAP Receive Challenge
23:34:43, 29 Jul.
( 5735.250000) Starting CHAP authentication with peer
23:34:43, 29 Jul.
( 5735.250000) PPP LCP Receive Configuration ACK
23:34:43, 29 Jul.
( 5735.240000) PPP LCP Send Configuration Request
23:34:42, 29 Jul.
( 5734.110000) PPP LCP Send Configuration ACK
23:34:42, 29 Jul.
( 5734.110000) PPP LCP Receive Configuration Request
23:34:40, 29 Jul.
( 5732.210000) PPP LCP Send Configuration ACK
23:34:40, 29 Jul.
( 5732.210000) PPP LCP Receive Configuration Request
23:34:40, 29 Jul.
( 5732.090000) PPP LCP Send Configuration Request
23:34:37, 29 Jul.
( 5729.230000) ETHoA is up - VPI: 0, VCI:35
23:34:37, 29 Jul.
( 5729.230000) DSL is up
23:34:36, 29 Jul.
( 5728.350000) DSL noise margin: 21.00 dB upstream, 10.90 dB downstream
23:34:36, 29 Jul.
( 5728.280000) DSL line rate: 448 Kbps upstream, 8128 Kbps downstream
23:34:12, 29 Jul.
( 5704.670000) CWMP: session closed due to error: No response
23:34:12, 29 Jul.
( 5704.640000) CWMP: Server URL: https://pbthdm.bt.mo; Connecting as user: ACS username
23:34:12, 29 Jul.
( 5704.630000) CWMP: Session start now. Event code(s): '4 VALUE CHANGE'
23:33:42, 29 Jul.
( 5674.150000) CWMP: session closed due to error: No response
23:33:41, 29 Jul.
( 5673.000000) CWMP: Server URL: https://pbthdm.bt.mo; Connecting as user: ACS username
23:33:41, 29 Jul.
( 5672.990000) CWMP: Session start now. Event code(s): '4 VALUE CHANGE'
23:33:40, 29 Jul.
( 5672.560000) CWMP: Initializing transaction for event code 4 VALUE CHANGE
23:33:36, 29 Jul.
( 5668.110000) DSL is down after 92 minutes uptime
23:33:36, 29 Jul.
( 5668.100000) ETHoA is down after 92 minutes uptime
23:33:35, 29 Jul.
( 5667.670000) PPPoA is down after 92 minutes uptime [Waiting for Underlying Connection (WAN DSL - Up)]
23:33:32, 29 Jul.
( 5664.200000) PPP LCP Send Termination Request [User request]
23:29:51, 29 Jul.
OUT: BLOCK [7] ICMP replay (ICMP type 3 code 1 81.153.31.203->69.171.248.65 on ppp0)
23:28:50, 29 Jul.
( 5382.020000) CWMP: session completed successfully
23:28:48, 29 Jul.
( 5380.950000) CWMP: HTTP authentication success from https://pbthdm.bt.mo
23:28:46, 29 Jul.
( 5378.860000) CWMP: Server URL: https://pbthdm.bt.mo; Connecting as user: ACS username
23:28:46, 29 Jul.
( 5378.850000) CWMP: Session start now. Event code(s): '6 CONNECTION REQUEST,4 VALUE CHANGE'
23:28:46, 29 Jul.
( 5378.230000) CWMP: Initializing transaction for event code 6 CONNECTION REQUEST
23:26:03, 29 Jul.
( 5215.090000) CWMP: session completed successfully
23:26:02, 29 Jul.
This is some of the event log.

VPN Speed Issue

Hi all,
I am having a VPN speed issue. When I am using the internet and not connected to the VPN, I experience speeds of 25mbps/25, which is what my contract with Verizon calls for. When I connect to the VPN with my laptop, speeds drop to about 3/2 mbps. (I am connected via Ethernet hardwire not wireless)
I ran Ethernet wire to the Verizon box and then had Verizon activate. Unfortunately this did not solve my problem. Internet is fine until I connect to the VPN.
I also was able to conduct a test: I connected wireless to an open local network while in the office and then to my work server via the VPN with no noticeable speed issues. This leads me to believe the issue lies with the Actiontec router issued from Verizon?
I only work remotely 1x per week so have been hobbling along with this problem for the past 3 months since our switch from Comcast. (Speed was fine with Comcast ) It is painful as it causes a 5-10 second lag for each click when navigating folders on the remote server. This means it can take me 5 minutes to pull down one PDF file.
Is there a suggested solution for this - should I buy another router?
thanks,
Steve

No, usually, you dont have to wait. You do have to log into the router and go in and release the IP, but most of the time this is all you have to do.
Once in a while it wont release properly, in which case you do have to wait a couple of hours. But most of the time it will release just fine.
====================================================================================
Error exists between keyboard and chair.

DSL speed issues........I am about to cancel.

I have been a Verizon customer for over 14 years. These last two years with Internet have been abysmal. At least once a month, my internet is so slow that I can not even stream a simple TV show. Often it is completely down. I call customer service, and I get some guy in India. This is the most frustrating. The last time the guy asked me FIVE times if I had a dial tone on my home line. Each time I told him I have NO phone connected to that line. It is simply there to bring service to the house. When I can, I use chat because that seems to get me a more competent person. Each time there is an "issue with the line and we are sending your information up. SOmeone will call you." It is always the same thing. COngestion on the line, speed issues, issues with the connection. I am paying for a service that I can only use half of the time. It seems that since Verizon has brought in Fios, their DSL customers have suffered. We have no option to get fios, we are stuck with crappy DSL service and even less competent customer service reps to help us. I have priced, and will be switching to Cox if this issue is not resolved. I can get 50mpbs for $10 more than I am paying now for intermittent service. Is there anyone above the basic customer service reps who can help with this issue?

Your issue has been escalated to a Verizon agent. Before the agent can begin assisting you, they will need to collect further information from you.
Please go to your profile page for the forum, and look in the middle, right at the top where you will find an area titled "My Support Cases". You can reach your profile page by clicking on your name beside your post, or at the top left of this page underneath the title of the board.
Under “My Support Cases” you will find a link to the private board where you and the agent may exchange information. This should be checked on a frequent basis as the agent may be waiting for information from you before they can proceed with any actions.
To ensure you know when they have responded to you, at the top of your support case there is a drop down menu for support case options. Open that and choose "subscribe".
Please keep all correspondence regarding your issue in the private support portal.

Extremely slow downstream speed using ethernet

I have a G5 Dual 2.3. I started to notice that my downstream speed seemed to be slow. So I went to speakeasy.net to do a downstream rate test. Much to my amazement my downstream speed is 400-500kbps! It's normally 6000kbs since I have a cable modem.
I tried bypassing my router by plugging the cable modem directly into the ethernet port on my G5 and still had the slow speeds. For kicks I tried pluggint the cable modem directly into my G4 Powerbook and the downloads were now at 6100kbps!! ***!!
I then decided to try sharing the ethernet connection (with the cable modem plugged directly into it) from my Powerbook over my airport network using the powerbooks airport antenna. I then connected my G5 to my G4's shared internet connection and lo and behold, 6000+ kbps!! It seems like there is an issue by the ethernet connection on my G5. Anyone heard of anything like this?
Any suggestions as to what to do?
Thanks,
John
PowerMac G5 Dual 2.3 Mac OS X (10.4.4) 4.5 Gb RAM

This sounds like duplex mismatching. Try going into your network preferences and force the NIC to 100/FD and see if your speed is the same. What router are you using?

Speed Issue back Yet again ! BT HELP!

a few weeks back i had a issue with the speed of my line. It was down to a netowrk engineer working in the error.
My Speed returned back to the Good old speed after several days.
But today my internet went and now my speeds are down in the dumps again.
It seems to be BT in LCTOD is having more and more problems time after time after time i am getting sick of it.
Download speedachieved during the test was - 1585 Kbps
For your connection, the acceptable range of speeds is 600-7150 Kbps.
Additional Information:
Your DSL Connection Rate :5440 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
IP Profile for your line is - 4500 Kbps
Router Stats
Line state   Connected
Connection time   0 days, 04:23:54
Downstream   5,440 Kbps
Upstream   448 Kbps
ADSL Settings
VPI/VCI   0/38
Type   PPPoA
Modulation   G.992.1 Annex A
Latency type   Fast
Noise margin (Down/Up)   7.4 dB / 23.0 dB
Line attenuation (Down/Up)   48.1 dB / 27.5 dB
Output power (Down/Up)   8.3 dBm / 1.6 dBm
Loss of Framing (Local/Remote)   0 / 0
Loss of Signal (Local/Remote)   0 / 0
Loss of Power (Local/Remote)   0 / 0
FEC Errors (Down/Up)   0 / 3
CRC Errors (Down/Up)   516 / 2
HEC Errors (Down/Up)   9838 / 1
Error Seconds (Local/Remote)   191 / 4
New the internet disconnected over 4 hours ago and since then it has been sluggy, Its not only effecting my web surfing but also my game playing.
I checked my e-mails no sign of FUP or Even the 80GB warning nothing (80GB i haven't even got yet long way off).
I urge BT to solve this NOW!!!! this is going to be the very last time. I'll go back to the CEO's office if its not sorted and will tell them that i'll be leaving then prompty making my call to OFCOM and Watch dog this is getting to be joke.
I now laugh at BT adverts, We are the Worlds Leading Fast internet provider (SORRY BUT YOUR NOT!)
Please fix this problem.

Hi rogers1950,
I have checked a few things on your line this morning to see if there is anything obvious that could be slowing down your connection throughput speed.
The line hasn't been capped as you say and your exchange has hasn't been reported for having capacity issues, which is a fairly common factor in probems with slow throughput.
The stats that you have posted show the downstream speed and IP profile are all working well so at the moment the speed result looks purely the result of internet congestion. I note that you ran the test quite late in the evening, right in the middle of our peak times, so I would guess congestion was the cause.
Try and run a few more tests via www.speedtester.bt.com, if possible one before peaks times, 5pm-midnight, and one during so I can see a comparison.
Please post the results up
With a bit of luck last night was just a one off.
Cheers
Craig
BTCare Community Mod
If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
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WRT54G ver 7 speed issues.

Hi all.
Let me go through the issue I have come across tonight. I have a WRT54G version 7 cable router, and I have Telewest as my ISP, with the 4Mb service. My computer is hard wired into the router, and have no wireless clients connected at the time. I get packet loss, (quite a bit) and my download speeds are abismal. Setting my computer to dhcp or fixed IP makes no difference. I even forced 100 Full duplex on the LAN card just to be sure. I phoned up TW tech support, and they were pretty helpful, and asked me to bypass the router, and plug directly into the modem and turn dhcp on my pc and reboot the modem.
All works fine, no speed issues, download test from here is perfect. They asked me to download something off their server here http://gamefiles.blueyonder.co.uk and I am getting full 480kB/s And here is the test plugged right into the modem http://www.thinkbroadband.com/speedtest/results/id/117018476054017621619.html
Happy days, right? Problem with the router, right?
Well.. It gets interesting.
I then do a firmware update on the router, reset it to factory defaults, and re-run the test going through the router. Here is the pitiful result., which is the same as before. http://www.thinkbroadband.com/speedtest/results/id/117018491367303621734.html
Ok... so problem with the router still... right?
I tried the blueyonder file download, and guess what... 480KB/s again, downloaded a 5 meg file in about 12 seconds.
What I have tried:
Forcing the LAN to 100Meg full duplex
Firmware upgrade on the router
Reset router to factory defaults
Rebooted pc, router and modem at the same time.
Use a static IP with correct settings (same speed)
Use DHCP through the router
Connected directly to the cable modem and use DHCP (works fine)
PC windows xp SP2 fully patched.
No software firewalls. (at any time)
Disabling UPNP on the router
Turned flow control off on the LAN adapter (shouldnt be on in the first place, thats half duplex >.)
I cant see why my computer downloads from blueyonder fine with no speed issues at all, and yet any other website, I get extremely poor performance. This router has been working fine for about a month now, just needed a few reboots once in a while, but which router doesnt. My upload speeds seem pretty constant, and dont seem to vary regardless of router or not. Seems like inbound traffic is getting jammed.
Anyone able to shed some thought? Sorry for the wall of text, just thought I would let you know everything on the first post instead of having to reply a dozen times.

try TCP Optimiser .. This should adjust the MTU settings of the NIC on the PC ...

Speed Issues

Greetings and Salutations,
I'm having speed issues with my Adobe AIR application. From what I've read on the web, AIR is supposed to be fast at drawing graphics. I am writing an application which has multiple screens. On one of the screens I have a tab (SuperNavigator) which has a canvas on it. That canvas has a series of other canvases (built with a repeater) that have graphics in them. I am having speed issues when I have more than 50 of these children canvases. I've tried running it without the graphics (code below is without the graphics) to see how it performs. When I have 954 of these canvases being drawn it takes about 2.5 minutes to draw. This is unacceptable and I'm wondering if this is something I've induced or if AIR was never meant to handle such a large amount of canvases (actually this isn't a large amount, in a real world environment there could be a lot more). I've included relevant clips from the code. There are a couple empty boxes that in the real application will hold graphics.
The class withing the Tab Navigator is a canvas.
In the action Script (the setter line takes 2.5 minutes to get past) (it's binding to the repeater that seems to be my problem).
[Bindable] private
private var _assetList:Array;
[Bindable]
public function get timelineAssetList():Array{
     return this._assetList;
public function set timelineAssetList(ac:Array):void{
     this._assetList = ac;
The MXML code that is being bound to:
<mx:Canvas id="labelCanvas" left="0" right="0" top="0" height="65" verticalScrollPolicy="off" scroll="scrolling(event)">
      <mx:HBox horizontalGap="1" left="10" right="10" top="10">
          <mx:Spacer width="2"/>
            <mx:Canvas width="{getHeaderWidth()}" height="40" borderStyle="solid" borderColor="{StaticVariables.borderColor.getColorUint()}" horizontalCenter="0">
            <PastDataView:ColorBarScale id="scale" bottom="10"/>
     </mx:Canvas>
          <mx:Canvas width="20" height="40">
               <mx:Spacer width="20" />
          </mx:Canvas>
     </mx:HBox>
</mx:Canvas>
<mx:Canvas id="assetCanvas" left="0" right="0" bottom="0" top="65" scroll="scrolling(event)">
     <mx:VBox y="10" right="16" left="10" verticalGap="0">
          <mx:Repeater id="assetRepeater" dataProvider="{timelineAssetList}">
               <mx:HRule width="100%"/>
               <PastDataView:ColorBarBar id="barArray" width="100%" height="170" asset="{assetRepeater.currentItem}"/>
          </mx:Repeater>
     </mx:VBox>
</mx:Canvas>
The ColorBarBar consists of:
<?xml version="1.0" encoding="utf-8"?><mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="400" height="300" xmlns:PastDataView="org.XXXXXX.CenterScreen.PastDataView.*" horizontalScrollPolicy="off" click="clicked()">
     [Bindable]
     public static var _colorBarHeight:int = StaticVariables.colorBarHeight;
     [Bindable]
     private var _asset:Object;
     [Bindable]
     public function set asset(a:Object):void{
          this._asset = a;          getBackgroundColor();
     public function get asset():Object{
          return _asset;     }
      private function getBackgroundColor():void {
          var color:String = asset.color;
          if (color == null) color = "Black";
          if( color.toLowerCase() == "blue" ) {
               lblAssetTag.setStyle("color", 0x1674cc);               lblAsset.setStyle(
"color", 0x1674cc);          }
else if( color.toLowerCase() == "red" ) {
               lblAssetTag.setStyle("color", 0xe35353);               lblAsset.setStyle(
"color", 0xe35353);          }
else if(color.toLowerCase() == "grey" || color.toLowerCase() == "gray") {               lblAssetTag.setStyle(
"color", 0xe55555);               lblAsset.setStyle(
"color", 0xe55555);          }
else { // give it a default color                lblAssetTag.setStyle(
"color", 0x000000);               lblAsset.setStyle(
"color", 0x000000);          }
      private function calculateActivityRepeaterHeight():int{
          return this.height-50-_colorBarHeight;     }
      public function clicked():void{
          dispatchEvent(new SelectAssetEvent(this._asset, false, false, true));     }
     ]]>     </mx:Script>
       <mx:VBox left="0" top="0" right="0">
           <mx:Spacer height="1"/>
           <mx:HBox>
                <mx:Spacer width="2"/>               <mx:Label id="lblAssetTag" text="{asset.type}: " fontWeight="bold" fontSize="12" doubleClickEnabled="true" doubleClick="titleClicked()"/> id="lblAssetTag" text="{asset.type}: " fontWeight="bold" fontSize="12" doubleClickEnabled="true" doubleClick="titleClicked()"/> id="lblAssetTag" text="{asset.type}: " fontWeight="bold" fontSize="12" doubleClickEnabled="true" doubleClick="titleClicked()"/>
               <mx:Label id="lblAsset" text="{asset.name}" fontSize="12" doubleClickEnabled="true" doubleClick="titleClicked()"/>
                <mx:Label id="lblAssetId" text="{'(' + asset.id + ')'}" fontSize="12" visible="{mx.core.Application.application.debugMode}"/>
           </mx:HBox>
          <mx:HBox horizontalGap="1">
                <mx:Spacer width="2"/>
                <mx:Spacer width="10" />
                <mx:VBox width="100%">                    <mx:VBox>
                    </mx:VBox>
                    <mx:VBox id="displays" verticalScrollPolicy="auto" height="{calculateActivityRepeaterHeight()}" horizontalScrollPolicy="off">
                    </mx:VBox>
               </mx:VBox>
          </mx:HBox>
          <mx:Spacer height="2"/>
      </mx:VBox></mx:Canvas>
I would appreciate any thoughts or feedback you could provide.
~martin

The Canvas is a very heavy object that has lots of overhead. Even worse is the VBox object that is in there multiple times.
What exactally are you trying to accomplish? Just looking over the code, it seems that the same could be done directly with the Graphics API, at a much faster rate.
For each of the VBoxes and Canvases you have, the entire size of each child and parent need to be re-evalulated each time you add or change something. This is a HUGE overhead, and probably why the app is running so slow. You may need to convert this app to use simpler objects (UIComponent or something lower-level like that) to get any speed.
Are you using Flex Bulder? Take a look at the app while the Profiler is running to see what I'm talking about.

Speed Issues Fixed In 9.1.2

Lost all my thumbnails updating to iPhoto 9.1.2 but rebuilding the thumbnail database solved the problem. Best of all, the speed issues are finally gone in iPhoto 9.1.2. Opening the application is way faster again (2 seconds as opposed to 12 seconds or more). Scrolling is way faster again. Can't believe it took this long for Apple to fix this mess. Nevertheless, iPhoto '11 feels like iPhoto '09 once again. Thanks Apple.

Lost all my thumbnails updating to iPhoto 9.1.2 but rebuilding the thumbnail database solved the problem. Best of all, the speed issues are finally gone in iPhoto 9.1.2. Opening the application is way faster again (2 seconds as opposed to 12 seconds or more). Scrolling is way faster again. Can't believe it took this long for Apple to fix this mess. Nevertheless, iPhoto '11 feels like iPhoto '09 once again. Thanks Apple.

Iteration Speed issue when Indexing 3D array wried to a while-loop

Brief Description of my Program:
I am working on the real-time signal generation by using LabView and DAQmx (PCI-6110 card). My vi reads the big data file (typically 8MB txt file containing about 400,000 samples (complex double precision). Then, the signal is pre-processed and I end up with a huge 3D array to feed while-loop (typically 3D array dimension is N x 7 x M where N & M >> 7). Inside the loop, that 3D array is indexed and processed before the results are written to the DAQmx outputs. I have a speed issue when indexing the large 3D array (i.e, 3D array having a large sub-array size). My while-loop could not run fast enough to top-up the DAQmx AO buffer (at the output rate of 96kHz). It could run faster only if I use smaller 3D array (i.e, smaller-sized sub-arrays). I do not quite understand why the size of 3D sub-array affects the rate of looping although I am indexing same sub-array size at each iteration. I really appreciate your comments, advices and helps.
I include my 3D array format as a picture below.
Question on LabView:
How does indexing an 3D array which wires to the while-loop affect the speed of the loop iteration? I found that large dimension of sub-arrays in the 3D array slows down the iteration speed by comparing to indexing the same size of sub-array from smaller-sized sub-arrays of the 3D array to perform signal processing inside the while-loop. Why? Is there any other way of designing LabView Program to improve speed of iteration?
attachment:

Thank you all for your prompt replies and your interests. I am sorry about my attachment. But, I have now attached a jpg format image file as you suggested.
I had read the few papers on large data handling such as "LabVIEW Performance and Memory Management". Thus, I had already tried to avoid making unnecessary copies of data and growing arrays in my while-loop. I am not an expert on LabView, so I am not sure if the issues I have are just LabView fundamental limitations or there are any other ways to improve the iteration speed without reducing the input file size and DAQ output rate.
As you request, I also attach my top-level vi showing essential sections such as while-loop and its indexing. The attached file is as an image jpg format because the actual vi including Sub-VIs are as big as 3MB in total. I hope my attachment would be useful for anyone who would like to reply my question. If anyone would like to see my whole vi & llb files, I would be interesting to send it to you by an e-mail privately and thus please provide your e-mail address.
The dimension of my 3D array is N x 7 x M (Page x Row x Column), where N represents number of pages in 3D array, and M represents the size of 1D array. The file I am currently using forms 3D array of N = 28, & M = 10,731. Refering to the top-level vi picture I attached, my while-loop indexes each page per iteration and wrap-around. The sub-VI called "channel" inside the while-loop will further index its input (2D array) into seven of 1D arrays for other signal processsing. The output from that "channel" sub-VI is the superposition of those seven arrays. I hope my explaination is clear.
Attachement: 3Darray.jpg and MyVi.jpg
Kind Regards,
Shein
Attachments:
3Darray.jpg ‏30 KB
MyVI.jpg ‏87 KB

Windows 7 64bit speed issues

Hi,
Our company have been purchasing iMacs for the past 4-5 years and installing Windows XP without any problems. Last year we started installing Windows 7 64 bit onto, the then current, leopard model without any issues.
We have recently purchased a whole batch of i5 iMacs with lion installed. I have installed Windows 7 64 bit without any problems but have started noticing huge slowdown with what seems to be hard drive access o every single machine. Even a single one we purchased when they first came out.
Using Perfmon I cant see any stress on the CPU, GFX card or RAM but there seems to be something odd with the hard drive access. I have stripped Windows 7 down to its bare minimum services removing Aero, themes, and all non essential services but still the speed issues occur.
I have messed around with the pagefile size, indexing, etc, but nothing is having any impact.
For example, when I save a simple spreadsheet the saving window appears in Windows 7 with the spinning circle for around 30 seconds. This is a tiny file, why is it taking so long. Its virtually instant if done on a Windows XP bootcamp machine or even in Windows 7 on an older Leopard iMac.
There really isnt a great deal regarding this problem oin the internet but it has occurred on all the new i5 Lion iMacs we have.
Does anyone have any other suggestions (serious ones ) that I could try?
I am currently installing the 32 bit version to see if it is a driver issue.
Cheers

isn't apple now using propritary drive firmware in 2011 imac?
I suspect 30 sec is drive delay spinup and is frequently happens with green drives, I have some and do this. swap for WD black or something.
www.hardmac.com talks about imac drives

Facing speed issue in my iphone 4, 16gb

Hi Guys
I am facing speed issue in my iphone 4, 16gb. may after updating ios 7, currenly i am using 7.0.4 update.
please help me if anyone have soltion.
Regards
Parveen

Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new). Try each of these in order until the issue is resolved.
The iPhone4 runs iOS7 without any issues or performance problems.
Apple does not provide a method to downgrade the iOS on any iDevice. Discussion of such matters in these forums is against the terms of use.

Post Moved Slow-speeds-after-6-months

M oved to Infinity board http://community.bt.com/t5/BT-Infinity/Slow-speeds-after-6-months/td-p/767428
If you want to say thanks for a helpful answer,please click on the Ratings star on the left-hand side If the reply answers your question then please mark as ’Mark as Accepted Solution’

Hi Ryant, the test test says i should contact my isp, so i`ll give BT a ring. Cheers.

Is there any difference in downstream speed betwee...

Quick question. I'm aware that BT Infinity offers downstream speeds of up to 40Mbps. I'm currently on option 1 with a downstream speed of 33Mbps / 2Mbps up.
Does anyone know, If I were to change to option 2, would the increased upstream speed have a negative impact on the downstream speed my line can give? i.e. would the faster upstream mean the downstream speed may be reduced - or is the downstream speed protected regardless?
I'd be interested to hear anyone's experience of switching between the two packages

No. They are both identical analog audio outputs.

Audio pitch / playback speed issue, MacBook Pro 10.4.10

I experienced a very strange audio pitch and speed issue that affected a recording I was making in Ableton Live 6.0.3.
Setup is MacBook Pro 2.16GHz, Mackie Onyx Satellite FW interface for audio, recording straight to internal HD.
I made two multitrack recordings (3-4 tracks each) which played back fine initially within Live. I then rendered the audio to AIFF in order to burn data and audio CDs.
Testing the playback in iTunes, the audio was strangely pitched lower than what we originally recorded. Checking other tracks from my iTunes library, they were playing back FASTER or higher-pitched than normal, and so did audio streamed from MySpace that I was familiar with.
CDs burnt from these AIFFs exhibited the same "lower pitch" / slower playback.
Reopening the Live Set, they were now also playing back lower pitched than what we had heard just minutes beforehand during the recording / mixing.
After I let the computer sleep for a few hours, I came back and checked -- system and internet audio was now playing back at normal speed, but the Live Set was still lower-pitched - the individual WAV files in the set were all pitched lower.
The Live recording prefs were stock standard - set to record 24 bit WAV at 44.1Khz. Since the issue seemed to affect non-Live audio as well, I'm guessing it was something more at the CoreAudio level?
I managed to salvage the session by taking the exported AIFFs into Tracktion 3 and using the pitch change function in the Clip Properties pane. One track was 1.5x off, the other was 1.125x off.
I'm at a complete loss as to why this would happen. It's a first (and hopefully only) occurrence. Has anyone had this happen to them? Could this be some sort of intermittent hardware (clock) glitch? Something to do with 6.0.3 and OS 10.4.10?
I do need to take this MacBook Pro in for servicing - it experienced the "bulging battery" issue and has a partially dead keyboard (the keys near the upper right) - but even with those issues I've not had audio issues like this.

In any case, if my Mac had problems, I'd send it in for service....!!!
About your problem, I don't think that it depends on hardware.
I'd check Live configuration and the SR of the audio files: you know, Live has so many features to modify speed and a lot of other parameters that bacomes easy to forget something.
Try recording something with Garage Band so you will be sure if there is a real problem.
cheers
rob

Rah! Downstream speed issue - 4 months+

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